Unable to properly render .h files
Answered
I'm trying to open a .h file and although the file opens and its contents are visible, I get an error at the top telling me that:
There is an error. <file entry> expected, got '#'. Error line number: 1

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Check which plug-in handles this file type, it may be now what you expect. IntelliJ IDEA has no support for .h files out of the box, so it may help if you map it to the Text Files instead, see http://stackoverflow.com/a/13374653/104891.
Hey Serge,
IntelliJ did ask me at some point if I want to install a plugin for such a file but I don't remember which one and looking through the Plugins list is not that helpful.
But thanks! I'll keep searching
You can easily find the mapping at https://www.jetbrains.com/help/idea/file-types.html.